Global Positioning System (GPS) provides precise timing, position, and velocity information by utilizing the constellation of satellites and a remote receiver that uses range measurements to the satellites and spatial trilateration techniques. In addition, more navigation satellite systems including Russia’s GLONASS, Europe’s Galileo, and PRC’s Compass will be available for the coming years. Those systems will form the mainframe of future Global Navigation Satellite System…

This article assesses the security of eLoran and discusses how its features can be utilized to provide defenses against likely attacks

Global Navigation Satellite Systems (GNSS) have become increasingly interwoven into the fabric of our infrastructure and economic system. However, as the services provided by GNSS become more important for safety …

The reference scenario is defined by a set of navigation systems; each system is composed by a set of signal generators (constellation) and by a common time reference. Each transmitter must be synchronized to the time base; this operation is performed using different algorithms in order to generate a time correction to be transmitted to the receiver…

Accurate and continuous position computation is a key task for vehicle navigation and telematics applications. In most portable car navigation and telematics devices, the position is determined based only on GPS data. However, in urban canyons stand-alone GPS suffers signal masking and reflections of the signal from buildings, large vehicles, and other reflective surfaces. Driving tests in such metropolises as Hong Kong…

The 746th Test Squadron (746 TS) recently completed qualification testing on the F-22 Raptor’s Global Inertial Navigation System (GINS). The program is the second of two iterations of major test efforts the 746 TS has conducted on the system since 2001…

From the early days of the development of basic navigational software built into satellite navigational receivers, it has been noted that for the sake of simplicity and a number of other reasons, this navigational software is often based on methods of limited accuracy [1]. It is surprising that even nowadays the use of navigational software is still used in a loose manner, sometimes ignoring basic principles and adopting oversimplified…

The Global Positioning System(GPS) (Brown and Hwang 1997; Farrell and Barth 1999; Gelb 1974) and inertial navigation system (INS) have complementary operational characteristics and the synergy of both systems has been widely explored. An integrated GPS/INS system is typically carried out through the extended Kalman filter (EKF). The EKF is the approximate nonlinear filters which linearizes the system…

LBS appear to be one of the next natural steps in our move towards a truly unwired permanently connected society

The past decade has seen a quantum jump in mobile usage driven by two factors – one on the basic premise that almost everyone talks and walks and secondly, the underlying technology that has enabled this …

Because of the MEMS inertial sensors being more and cheaper, most studies focus on their applications. It is known that the simple principle and construction of the MEMS accelerometer make it is possible to improve the performance of MEMS accelerometers faster than that of gyros, so most efforts are done to use only the linear accelerometers forming the IMU called IMU-BA which has the potential market in the land and air navigation system, such as the car…